Keyboard



FIG. 1 is a front perspective view of a keyboard showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of the various unshaded elements of the keyboard in the figures is for environmental purposes only and forms no part of the claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 